Granted Patent
Utility
US 4,693,339 · App. 06/919,439
Muffler for gas inducting machinery generating low frequency noise
Inventors:
Michael Beale, David H. Kashy
Patented Case
View Patent ↗
Granted: Sep 15, 1987
Filed: Oct 16, 1986
Inventors
Michael Beale
David H. Kashy
Assignee (at issue)
Newport News Shipbuilding and Dry Dock Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.